CONSOLIDATED STATEMENTS OF CASH FLOWS - Entity [Domain] - USD ($)	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net Income	$ 672,278,000	$ (424,905,000)
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Provision for loan losses	116,269,000	134,750,000
Goodwill Written Off Related To Business Unit To Be Disposed		186,511,000
Amortization of intangibles	4,985,000	5,007,000
Depreciation and amortization of premises and equipment	23,949,000	23,832,000
Net (accretion of discounts) amortization of premiums and deferred fees	(42,167,000)	324,779,000
FDIC loss share (income) expense	(23,214,000)	79,467,000
Adjustments (expense) to indemnity reserves on loans sold	4,107,000	17,801,000
Losses (earnings) from investments under equity method	(9,806,000)	(24,355,000)
Deferred income tax expense (benefit)	(511,128,000)	2,689,000
Loss (gain) on: [Abstract]
Disposition of premises and equipment	(1,429,000)	(2,551,000)
Net Gain Loss On Sale And Valuation Adjustments On Investment Securities	(5,000)	0
Gain Loss On Sales Of Loans Net Including Mortgage Banking Activities	(15,034,000)	(42,413,000)
Gains Losses On Sales Of Other Real Estate	54,711,000	(2,035,000)
Acquisitions of loans held-for-sale	(249,059,000)	(159,727,000)
Proceeds from sale of loans held-for-sale	51,062,000	72,757,000
Net disbursements on loans held-for-sale	(379,264,000)	(338,672,000)
Increase (Decrease) in Operating Assets [Abstract]
Trading securities	481,271,000	459,792,000
Accrued income receivable	(656,000)	6,721,000
Other assets	33,552,000	(48,455,000)
Increase (Decrease) in Accounts Payable and Accrued Liabilities [Abstract]
Interest payable	475,000	633,000
Pension and other postretirement benefit obligations	1,641,000	(3,096,000)
Other liabilities	(41,438,000)	30,260,000
Total adjustments	(479,887,000)	739,531,000
Net cash (used in) provided by operating activities	192,391,000	314,626,000
Cash flows from investing activities:
Net increase in money market investments	(1,432,552,000)	(808,491,000)
Payments To Acquire Investments Abstract
Available-for-sale	(985,427,000)	(1,079,586,000)
Held-to-maturity	(250,000)	0
Other	(12,805,000)	(51,097,000)
Proceeds From Sale Maturity And Collections Of Investments Abstract
Available-for-sale	867,168,000	816,830,000
Held-to-maturity	2,389,000	27,029,000
Other	31,592,000	64,724,000
Proceeds from sale of investment securities available-for-sale	70,005,000	0
Proceeds from sale of other investment securities	8,399,000	0
Net repayments on loans	374,224,000	473,336,000
Proceeds from sale of loans	27,780,000	87,983,000
Acquisition of loan portfolios	(140,671,000)	(289,292,000)
Net Payments From FDIC Under Loss Sharing Agreements	164,423,000	110,618,000
Cash Received from Doral Bank Transaction	738,296,000	0
Payments To Acquire Advance Payments By Borrowers For Taxes And Insurance	(3,897,000)	0
Payments To Acquire Businesses Gross	(17,250,000)	0
Mortgage servicing rights purchased	(2,400,000)	0
Acquisition of premises and equipment	(30,817,000)	(20,333,000)
Proceeds from sale of: [Abstract]
Premises and equipment	7,901,000	8,631,000
Foreclosed assets	98,287,000	81,010,000
Net cash (used in) provided by investing activities	(235,605,000)	(578,638,000)
Net increase (decrease) in: [Abstract]
Deposits	745,787,000	252,715,000
Federal funds purchased and assets sold under agreements to repurchase	(150,413,000)	418,381,000
Other short-term borrowings	(48,215,000)	(370,000,000)
Payments of notes payable	(430,003,000)	(111,030,000)
Proceeds from issuance of notes payable	103,231,000	31,905,000
Proceeds from issuance of common stock	2,536,000	3,048,000
Dividends paid	(1,861,000)	(1,862,000)
Net Payments For Repurchase Of Common Stock	(1,695,000)	(861,000)
Net cash (used in) provided by financing activities	219,367,000	222,296,000
Net (decrease) increase in cash and due from banks	176,153,000	(41,716,000)
Cash and due from banks at beginning of period	381,095,000	423,211,000
Cash And Cash Equivalents Including Cash From Discontinued Operations	557,248,000	381,495,000
Discontinued Operations Cash And Cash Equivalents	0	18,923,000
Cash And Cash Equivalents At End Of Period	557,248,000	362,572,000
Segment, Discontinued Operations [Member]
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Provision for loan losses	0	(6,764,000)
Goodwill Written Off Related To Business Unit To Be Disposed	0	(186,511,000)
Mortgage Banking Activities [Member]
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Mortgage Servicing Rights MSR Impairment Recovery	6,846,000	15,836,000
Segment, Continuing Operations [Member]
Cash flows from operating activities:
Net Income	670,922,000	(263,081,000)
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Amortization of intangibles	4,985,000	4,051,000
Depreciation and amortization of premises and equipment	23,949,000	23,031,000
Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net	14,445,000	0
Adjustments (expense) to indemnity reserves on loans sold	$ 4,107,000	$ 17,801,000